Just before President Obama left office, his administration finalized new regulations banning Social Security recipients from buying a gun if they have trouble managing their finances.

About 10 percent of all people 65 and older risked being classified as "financially incompetent" – about 4.2 million in all.

Using the Congressional Review Act, Republicans and two Democrats passed a bill overturning the regulation. But the bill did more than that. It also prevents any future president from reinstituting the ban without new legislative authorization from Congress.